CellSIM USIM Specification


CellSIM OS is targeted as a firmware of secure smart card ICs for telecom and Internet applications where security and interoperability is a key issue. Functional roadmap covers almost 100% of features required buy today's applications.


Hardware platforms

CellSIM is ported to several secure MCU platforms and our customers are given a choice to select between several options. At the moment support is provided for several ST Microelectronics, Samsung and Starchip SIM platforms.

System Architecture

CellSIM USIM operating system has following major components:

  • Hardware abstraction layer supporting various hardware designs;
  • Virtual machine and runtime environment based on Java Card 2.2 standards;
  • ETSI UICC Platform supporting up to Release 6;
  • Global platform 2.1.1 component;
  • Cryptographic library;
  • Network access applications for 2G, 3G and CDMA networks;
  • Value-added applications including SIM Browsers and DSTK.


Virtual Machine

  • Core JVM and Runtime Environment 2.2.1 or 2.2.2
  • Integer support
  • Object deletion mechanism
  • Automatic garbage collection

Global Platform

CellSIM is fully compliant to Global Platform 2.1.1 specifications and supports following features:

  • Core functionality ( Open Platform Card Specification 2.1.1,Compliance Packages, Mandatory package 0);
  • Full Issuer Security Domain Support (Open Platform Card Specification 2.1 Compliance Packages, Chapter.4);
  • Secure channel protocol 02
  • Global Platform Java Card API 2.1

Extended features

Security domain support:

  • Support for additional security domains. As declared by Open Platform Card Specification 2.1 Compliance Packages, Chapter.5;
  • Delegated management. GP Card Spec. 2.1.1 - 7.6, 7.7
  • Extended Key management support. As declared by Open Platform Card Specification 2.1 Compliance Packages, Package 11, Package 13

Security channel:

  • R-MAC support. SCP02 is precondition, GP Card Spec. 2.1.1 - appendix E.1
  • CVM Management. GP Card Spec. 2.1.1 - 6.9
  • Resource Allocation. As declared by Open Platform Card Specification 2.1

 Other features

  • DAP Verification Support, GP Card Spec. 2.1.1 - 7.5;
  • Supplementary logical channels support, GP Card Spec. 2.1.1 - 6.5

Cryptography Library

  1. AES. Advanced Encryption Standard (AES), as defined by NIST in FIPS 197.
  2. CRC16/CRC32. Cyclic redundancy check
  3. DES/TDES. The Data Encryption Standard, as defined by NIST in FIPS 46-1 and 46-2.
  4. SHA-1. Secure Hash Algorithm, as defined in Secure Hash Standard, NIST FIPS 180-1.

Terms of Usage

Privacy Policy

This privacy policy sets out how Cellnetrix uses and protects any information that you give Cellnetrix when you use this website.

Cellnetrix is committed to ensuring that your privacy is protected. Should we ask you to provide certain information by which you can be identified when using this website, then you can be assured that it will only be used in accordance with this privacy statement.

Cellnetrix may change this policy from time to time by updating this page. You should check this page from time to time to ensure that you are happy with any changes. This policy is effective from 01.01.2011.

What we collect

We may collect the following information:

  • name and job title
  • contact information including email address
  • demographic information such as postcode, preferences and interests
  • other information relevant to customer surveys and/or offers

What we do with the information we gather

We require this information to understand your needs and provide you with a better service, and in particular for the following reasons:

  • Internal record keeping.
  • We may use the information to improve our products and services.
  • We may periodically send promotional emails about new products, special offers or other information which we think you may find interesting using the email address which you have provided.
  • From time to time, we may also use your information to contact you for market research purposes. We may contact you by email, phone, fax or mail. We may use the information to customise the website according to your interests.


We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure, we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect online.

How we use cookies

A cookie is a small file which asks permission to be placed on your computer's hard drive. Once you agree, the file is added and the cookie helps analyse web traffic or lets you know when you visit a particular site. Cookies allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.

We use traffic log cookies to identify which pages are being used. This helps us analyse data about webpage traffic and improve our website in order to tailor it to customer needs. We only use this information for statistical analysis purposes and then the data is removed from the system.

Overall, cookies help us provide you with a better website by enabling us to monitor which pages you find useful and which you do not. A cookie in no way gives us access to your computer or any information about you, other than the data you choose to share with us.

You can choose to accept or decline cookies. Most web browsers automatically accept cookies, but you can usually modify your browser setting to decline cookies if you prefer. This may prevent you from taking full advantage of the website.

Links to other websites

Our website may contain links to other websites of interest. However, once you have used these links to leave our site, you should note that we do not have any control over that other website. Therefore, we cannot be responsible for the protection and privacy of any information which you provide whilst visiting such sites and such sites are not governed by this privacy statement. You should exercise caution and look at the privacy statement applicable to the website in question.

Controlling your personal information

You may choose to restrict the collection or use of your personal information in the following ways:

  • whenever you are asked to fill in a form on the website, look for the box that you can click to indicate that you do not want the information to be used by anybody for direct marketing purposes
  • if you have previously agreed to us using your personal information for direct marketing purposes, you may change your mind at any time by writing to or emailing us at office@cellnetrix.com

We will not sell, distribute or lease your personal information to third parties unless we have your permission or are required by law to do so. We may use your personal information to send you promotional information about third parties which we think you may find interesting if you tell us that you wish this to happen.

You may request details of personal information which we hold about you under the Data Protection Directive (95/46/EC) . 

If you believe that any information we are holding on you is incorrect or incomplete, please write to or email us as soon as possible at the above address. We will promptly correct any information found to be incorrect.


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